Device for the transverse cutting of at least one web in a folding apparatus

ABSTRACT

A printed, endless web is transversely cut by the cooperation of a cutting blade cylinder and a sheet gripping cylinder that also carries cutting blocks. If the web that is to be cut, is noted as having a defect, for example in the printing applied to it, the cutting blades can be withdrawn into the cutting blade cylinder and the deflective web can be diverted away from the folding apparatus.

FIELD OF THE INVENTION

The present invention is directed to a device for the transverse cuttingof at least one web in a folding apparatus by use of a cutting bladecylinder. The cutting blade cylinder has at least one cutting blade andthis at least one cutting blade can be retracted inside thecircumference of the cutting blade cylinder.

BACKGROUND OF THE INVENTION

EP 0 559 077 A1 and DE 42 11 187 A1 describe cutting cylinders whosecutting blades can be retracted.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a device for thetransverse cutting of at least one web in a folding apparatus by use ofa cutting blade cylinder.

This object is attained according to the present invention by providingthe cutting blade cylinder with at least one cutting blade that can beretracted inside the circumference of the cutting blade cylinder. Thecutting blade cylinder is disposed opposite to a cylinder with pointneedles. Both the cutting blade or blades and the point needles can beretracted in the vicinity of a nip between the two cylinders. Theretractable cutting blade or blades are coupled to rollers that roll ona cam. The cam can be moved to deploy and to retract the cutting bladein the circumferential direction of the cutting blade cylinder.

The advantages that can be achieved with the present invention arecomprised particularly in that the removal of uncut webs or of webs inthe form of cut ribbon sections or signatures is facilitated, whichremovals are easier to handle than the removal of wound webs. Inaddition, the signatures are supplied to an extraction system fordisposal, and can be sorted according to whether they are printed orunprinted. It is also possible to supply an uncut paper web ribbon tothe extraction system. Consequently, for example, a web infeed all theway into the folding apparatus can be carried out automatically withoutthe paper web speed having to be reduced. A manual winding-on of a paperweb before the folding apparatus entry can be eliminated.

Other advantages which can be achieved by the present invention are thatwhen feeding paper webs into a folding apparatus, individual paper webs,before their entry into a folding cylinder group, no longer have to bemanually disposed of, but instead, the paper webs are conveyed away cutinto signatures. This occurs until all the paper webs of the paper webribbon are together at the entry to the folding apparatus and cansubsequently be transversely folded all at once.

Together with a paper diversion apparatus, the device for the extractionof signatures of the present invention can also be used in the event ofmalfunctions of the folding system in the cylinder folding group or ofthe delivery belt. The placement of a known paper ribbon rejectionsystem, before, in the direction of web travel, the entry of the web orsignatures into the cylinder folding group can be eliminated.

BRIEF DESCRIPTION OF THE DRAWINGS

Several preferred embodiments of the present invention are shown in thedrawings and will be explained in detail below.

FIG. 1 schematically depicts a cross section through a cylinder group ofa folding apparatus provided with a device for the extraction ofsignatures from the folding apparatus in accordance with the presentinvention;

FIG. 2 is an enlarged depiction of the delivery device, guide, and entryinto the grasping and transporting apparatus in accordance with a firstpreferred embodiment of the present invention;

FIG. 3 is a detailed depiction of a drive mechanism of the deliverydevice;

FIG. 4 is a cross-sectional view taken along the line IV—IV of FIG. 3;

FIG. 5 shows a partial cutaway detail of the drive mechanism and of thecontrol unit of a stripping device according to FIG. 2 or 3;

FIG. 6 is an enlarged depiction of a cutting cylinder and of a point andcounter-cutting strip cylinder in accordance with a second preferredembodiment of a delivery device for the extraction of a signature inaccordance with the present invention.

FIG. 7 is a cross-section taken along the line VII—VII in FIG. 6; and

FIG. 8 shows an enlarged depiction of a cutting cylinder and a point-and counter cutting strip cylinder in accordance with a third preferredembodiment of a device for the extraction of a paper web in accordancewith the present invention.

DESCRIPTION OF PREFERRED EMBODIMENTS

Referring initially to FIG. 1, a cylinder folding group of a foldingapparatus 1 of a web-fed rotary printing press is comprised, forexample, of a two-field cutting blade cylinder 2, which has cuttingblades 3 and which cooperates with a three-field transport cylinder or acountercutting strip- and collecting cylinder 4. The collecting cylinder4 has counter cutting strips 6 that cooperate with the blades 3, sheetgripping mechanisms or holding elements, such as, for example,controlled point systems 7 with point needles 10, and folding blades 8.

The collecting cylinder 4 cooperates with a three-field folding jawcylinder 11 that has controlled folding jaw systems 9.

The folding jaw cylinder 11 is followed, in the direction of producttravel, by a delivery fan 12 and by a delivery belt 13. The foldingapparatus 1 can also be configured differently. For example, the countercutting strip- and collecting cylinder 4 can also be embodied as afive-field or seven-field cylinder with a corresponding folding jawcylinder 11 associated with it.

The transverse cutting device, which is comprised of the cutting bladecylinder 2 and of the transport cylinder 4, such as the collectingcylinder 4, is preceded by two generally conventional draw roller pairs14; 16. In the vicinity of their circumferences, the collecting cylinder4 and the folding jaw cylinder 11 each have paper guide devices, whichare not specifically shown, and which are comprised, for example, ofguide rails that are spaced apart from each other in the productiondirection.

The cylinder folding group 2; 4; 11 of the folding apparatus 1, and thedelivery fan 12 are supported in side frames 21, 22. The side frames 21;22 can be placed on machine frames 23; 24 that are disposed underneaththem, all as seen in FIG. 1.

A first preferred embodiment of a device for handling and, inparticular, for diverting a web or a material web, for example a paperweb or a paper web ribbon 26 which is comprised of several paper webs26, is positioned before or after a transfer point 17, 18 for signatures19, and has a switchable delivery device 27 or 25 that is useable todirect the web or signatures to a disposal apparatus 28, all as seen inFIGS. 1 and 2. The transfer point 17 for signatures 19 is disposed in anip between cylinder 4 and cylinder 11 and the transfer point 18 isdisposed between the cylinder 11 and the delivery fan 12.

The switchable delivery device 27 is shown in FIGS. 2 and 3 and can bedisposed on the circumference of the cylinder 2 or of the cylinder 4 andthe delivery device 25 can be disposed on the cylinder 11. Both of thedelivery devices 27 and 25 can be actuated by suitable control devices.

The delivery device 27 cannot function in the cutting region of thecylinder pair 2; 4 or in the vicinity of the transfer points 17; 18. Thedelivery device 27 is preferably actuated in the vicinity of the exitnip 29 of the cylinder pair 2; 4; i.e. before the transfer point 17 at arelease point 31 or after the transfer point 18 in a region “e” at arelease point 32. The delivery device 25 in this case is comprised of afolding jaw system 9 controlled in this region “e”. At the release point31 of the cylinder 4, as seen in FIG. 3 or 32 of cylinder 11, as seen inFIG. 1, the respective holding devices 7 and 9 are inoperative so thatthe beginning 33 of the paper web ribbon 26 or the beginning 34 of thesignatures 19 is conveyed to a switchable ribbon- or signature-grasping-and transporting apparatus 36, which is shown more clearly in FIGS. 1and 2.

In the case of the cylinder 4, as seen most clearly in FIGS. 3 and 4,the holding devices are comprised of point needle systems 7. Thedelivery device 27 of the cylinder 4 is embodied as a stripping device37 for the needles of the point needle systems 7. In terms of theproduction rotation direction of the cylinder 4, the stripping devices37 are respectively disposed after the point needle systems 7 and arecomprised of retracting devices 40, which encompass the point needles 10in a fork-shaped, or partial, fashion. The retracting devices 40 canalso completely encompass the point needles 10, such as, for example, ifthe retracting devices 40 have bores through which the point needles 10protrude.

These stripping devices 37 are connected to a pivotable cam segment 38,which is affixed to the side frames 21, 22 and which can be pivoted intoand out of position. In the event of an extraction, the signatures 19shown in FIG. 3, i.e. the paper web 26 transversely cut into pieces, areshunted downward from the point needles 10 of the point systems 7 byoperation of the retracting devices 40 of the stripping device 37 andare conveyed to the disposal apparatus 28, as shown in Fig.

Between the stripping device 27 and the ribbon, or signature-grasping,and transporting apparatus 36, a guide 39 or a switchable shunt isadvantageously disposed, spaced apart, at the circumference of thecollecting cylinder 4 and can be pivoted into a rest position A,depicted with dashed lines, or into a working position B, as seen mostclearly in FIGS. 1 and 2.

The guide 39 is comprised, for example, of a part of the paper guidedevice and is disposed close to the exit nip 29 of the transversecutting cylinder group 2; 4. The guide 39 is actuated, for example, bythe operation of pneumatic working cylinders 41, which are shown in FIG.2 and can be pivoted around a pivot axis 42 between the twoabove-mentioned positions A; B.

In the working position B of the guide or switchable shunt, the ends 43of the guide 39 which are remote from the pivot axis, cooperate with awedge-shaped, tapering entry nip 44 defined between two concurrentlyoperating endless belt systems 46; 47 of the ribbon orsignature-grasping and transporting apparatus 36 again as seen mostclearly in FIGS. 1 and 2. The belt systems 46; 47 are respectively eachguided over deflecting rollers 48; 49; or 51; 52 and over guide rollers53; 54. The deflecting rollers 49; 52 are driven, for example, by drivemotors. The two belt systems 46; 47 are disposed, for example, in aframe that is not shown. This frame can be pivoted by a drive mechanism,that is not shown, such as pneumatic working cylinders, from ahorizontal rest position C, depicted with dashed lines, into a verticalworking position D around a pivot axle 42 that is affixed to the sideframes, as seen most clearly in FIG. 1.

As will be discussed below, the point needle systems 7 passing throughthe exit nip 29 of the transverse cutting cylinder group 2; 4 can alsobe temporarily retracted as needed.

It is also possible to use other grasping systems, e.g. gripper systems,in lieu of the point needle systems 7.

It is also possible to dispose the above-mentioned grasping systems 7 onthe circumference of the cutting blade cylinder 2 and to suspend theiroperation in the event of an extraction in the vicinity of a releasepoint 30.

Signatures 19 are provided as transversely cut and possibly previouslylongitudinally folded sections of a paper web ribbon 26 or a paper web.

The disposal apparatus 28 is depicted in FIG. 1 and is comprised of agenerally known chopping mechanism 56. The signatures 19, which arechopped or shredded in the disposal apparatus are supplied by an airsuction-carrying conduit 57, and possibly by a conduit shunt 58, toanother conduit 59 or 61, either to a delivery point 62 for white orunprinted paper remnants or to a delivery point 63 for printed paperremnants.

The machine control station can act on the conduit shunt 58 by the useof a signal to select its position, e.g. for “pressure off” or “pressureon”,

Instead of situating a chopping mechanism 56 after it, the output of theribbon, or signature-grasping and transporting apparatus 36 can also beassociated with vertically situated conduits and subsequent conveyorbelts for transporting the signatures 19 to one or alternatively toseveral collecting receptacles. This can take place for both unprintedand printed signatures.

A method for handling a paper web beginning or a signature 19, using thedevice in accordance with the present invention takes place as follows:If, for example, new paper webs 26 are being fed into a web-fed rotaryprinting press, then the paper webs 26 arrive one after the other andpossibly individually before the entry to the transverse cuttingcylinder group 2; 4 of the folding apparatus 1. The beginnings orleading ends 33 of the paper webs 26 are continuously supplied to thetransverse cutting cylinder group 2; 4 that is provided with graspingmechanisms 7. By operation of the guide 39 or shunt, which is disposedin the working position B, and with the aid of the retraction device 40of the stripping device 37, the leading ends 33 of the paper web 26, aresupplied to the belt systems 46; 47, which are disposed in the workingposition D. In other words, the paper web leading ends 33 are divertedfrom the otherwise usual production process. Generally speaking, firstthe beginning 33 of the paper web ribbon 26 is gripped or pinned by thegrasping means, e.g. by the point needle systems 7, of the cylinder 4and is transported. For example, before the transfer point 17 of thesignatures 19 to the folding jaw cylinder 11 and in the exit nip 29 ofthe transverse cutting cylinder group 2; 4, the beginning 33 of thepaper web or of the paper web ribbon 26 is released by the point needlesystems 7, e.g. by use of the delivery device 27, and is then suppliedto the belt systems 46; 47 of the disposal apparatus 28.

If the release point 31 lies outside the exit nip 29 of the transversecutting cylinder group 2; 4, and at least in the vicinity of thetransfer point 17, then the signatures 19 are diverted at that point.

If the machine control station sends a signal which instructs the systemto discontinue web or signature extraction, then the delivery device 27executes its function by changing the position of the cam segment 38 andthe shunt or guide 39. The ribbon or signature-grasping- andtransporting apparatus 36 then assumes its rest position C, as depictedin dashed lines in FIG. 1 and the belt systems 46; 47 are pivoted intotheir rest position C. The signatures 19 then travel in the usual mannerthrough the folding apparatus 1.

If malfunctions occur during the course of production, then the devices27; 36 can be made operational again. The same is true when new paperwebs are fed in.

The collecting cylinder 4, as seen in FIG. 4, has end plates 71; 72 atits ends, which end plates 71; 72 are affixed to a shaft 73. The shaft73 is supported in a freely rotating fashion at both ends by bearings74; 76 and by bearing bushings 77; 78 affixed to the side frames. Shaft73 can be driven by a gear 79, as seen in FIG. 4. The end plates 71; 72support three circumferentially spaced point shafts 81, which shafts 81support the respective point needle systems 7 with the point needles 10.Alternatively, five or seven point shafts 81 can also be provided. Eachpoint shaft 81 is connected by a lever arm, which is not specificallyshown, and by cam rollers 82; 83 to a known cam 84 for the point needlesystems 7 affixed to the side frames, and to a cam 86, a so-calledcovering disk, which is rotatably supported on the bearing bushing 77and which can be driven by a transmission.

Preceding the point needle systems 7, in the direction of the rotationof the cylinder 4, stripping devices 37 that encompass the point needles10 in a fork-shaped fashion, in accordance with the present invention,are disposed on a hollow shaft 87, which is affixed to the end plates71; 72 and which contains a torsion spring. The segment-shaped camsegment 38, as seen in FIG. 3, which is affixed to the side frames andwhich can be pivoted by an angular amount a from a rest position G to aworking position F, is disposed at the release point 31 provided for theretraction, e.g. in the exit nip 29 of the transverse cutting cylindergroup 2; 4. By use of a shaft 88, which is guided by the bearing bushing78, and extending in a direction axially parallel to the shaft 73, andby use of a lever arm 89, the cam segment 38 is connected to ahydraulically operated working cylinder 91 that is affixed to the sideframes, all as seen in FIG. 4.

At its end adjacent the end plate 72, the bearing bushing 78 has acylindrical cam 92 disposed coaxial to the shaft 73, with a circularcontrol surface 93 on its circumference. A cam roller 94, with adouble-width running surface 96, revolves against this control surface93. The term “double-width” means that the running surface 96 of the camroller 94 is connected both to the control surface 93 of the cam 92 andto the control surface 35 of the cam segment 38. The cam roller 94 isconnected to the hollow shaft 87 of a lever arm 95.

The working cylinder 91 is embodied to be double-acting and is connectedof a control valve 97 to a pressure supply station 98, as depictedschematically in FIG. 5. The pressure supply station 98 includes, forexample, a hydraulic pump, a pressure regulator, a check valve, ahydraulic reservoir, and a measuring device. The control valve 97 is, inturn, connected by control lines 99; 101 to a control unit 102, whichis, in turn, connected by lines 103; 104 to a computer or controlstation and is also connected by of a line 106 to a sensor 107 that isaffixed to the side frame. The sensor 107 detects the respectiveposition of the cutting blade 3 by operation of a cam 109 restingagainst the shaft 108 of the cylinder 2.

The computer or control station sends signals to the control unit 102 bythe lines 103; 104. Consequently, the working cylinder 91 is suppliedwith hydraulic fluid by the control valve 97 and a line 111 so that thecam segment 38 is moved from the rest position G to the working positionF, as seen in FIG. 5. The deflection of the lever arm 89 andconsequently of the cam segment 38 is limited by stops 112:113 affixedto the side frames, also as depicted schematically in FIG. 5.

Through a rotation of the cam segment 38 by an angular amount α, of, forexample, 5°, the control surface 35 of the cam segment 38 slides againstthe control surface 93 of the cam 92, as shown in FIG. 5. By use of thedouble-width cam roller 94, the lever arm 95 is then lifted as it rollsover the control surface 35 and in so doing, the retracting device 40 ofthe stripping device 37 is also lifted up. As a result, the beginning 33of the paper web ribbon 26 is lifted up by the point needles 10 of thepoint needle systems 7, is diverted from the cylinder 4, and is suppliedto the disposal apparatus 28.

In the process of rolling against the control surface 93, thedouble-width cam roller 94 already has a particular speed, which is onlyincreased by a negligible amount as roller 94 travels over the controlsurface 35 of the cam segment 38.

If a signal for good signatures 19 is sent from the computer or from thecontrol station via the line 103; 104 to the control unit 102 and asignal of the sensor 107 conforms with this signal, then the workingcylinder 91 is supplied with hydraulic fluid via the control valve 97and a line 114, as a result of which the cam segment 38 is moved intothe rest position G.

This assures that only complete products, i.e. signatures 19, aretransferred to the cylinders of the folding apparatus 1 and theadditional processing apparatuses.

In accordance with a second preferred embodiment, a device for handling,extracting, or redirecting of signatures 19 or a beginning 33 of a paperweb 26 or a paper web ribbon is comprised, for example, of releasablegrasping mechanisms, e.g. of retractable point needle systems 7. Thepoint needle systems 7 are disposed on the collecting cylinder 117 ofthe first cylinder pair 2; 117, as seen in FIG. 6, and are disposed sothat they can be retracted inside the circumference 137 of thecollecting cylinder 117, at least in the vicinity of an exit nip 118, byoperation of a point needle system control mechanism 81, 119, 121, 122,134, 140.

As a result, the signatures 19 can be extracted from the usualproduction process after they pass through the exit nip 118 that isdisposed between the cutting blades cylinder 2 and the collectingcylinder 117 shown in FIG. 6. To that end, the cutting blade cylinder 2has, for example, two cutting blades 3 on its circumference, asdescribed above.

The point needles 10 are held in point needles holders 119 which aredisposed on a point shaft 81. A roller lever 121 is affixed to eachpoint shaft 81 and supports a double-width cam roller 122 at its end,again as shown in FIG. 6.

Two end plates 123; 124 support the collecting cylinder 117 on a shaft126, as shown in FIG. 7. The shaft 126 is supported in a freely rotatingfashion at both ends by bearings 127; 128 and by bearing bushings 129;131 which are affixed to the side frames. Shaft 126 can be driven by agear 132, as may also be seen in FIG. 7.

On one side of collecting cylinder 117, a portion of the double wide camroller 122 travels on a control surface 133 of the cam 134 affixed tothe side frame. The control surface 133 is embodied, i.e. is flattened,so that, in the vicinity of a nip 136 between the cutting blade cylinder2 and the collecting cylinder 117, the tips of the point needles 10 canbe retracted inside the circumference 137 of the collecting cylinder117, as is depicted in FIG. 6.

In the vicinity of the nip 136 is understood to mean in the vicinity ofan entry nip 138 and of an exit nip 118 of the cutting blade cylinder 2and the collecting cylinder 117.

Consequently, the signatures 19 cut by operation of the cutting blade 3and the counter cutting strip 6 can be supplied in the event ofdefective signatures to a ribbon or signature-grasping and transportingapparatus 36 and a disposal apparatus 28. In other words, thesesignatures can be separated out.

If the point needles 10 need to again protrude out from thecircumference 137 of the collecting cylinder 117 in the vicinity of thenip 136 in order to be able to transport the signatures 19 further, thenthe drivable covering disk 140 shown in FIG. 6 is rotated approximately90° counterclockwise, so that cover disk 140 then covers a flattenedregion 142 of the control surface 133 with a raised area 139 in itscontrol surface 141. The covering disk 140 is affixed to the rotatablebearing bushing 129, which bushing 129 also supports a toothed ring 143,as seen in FIG. 7. A rotation of the covering disk 140 is produced byuse of a gear segment 144, which is pivotable affixed to the side frameand which can be selectively moved into one of two positions byutilization of a working cylinder 146.

In lieu of the point needle systems 7, it is also possible to use othergrasping systems, for example other gripper systems.

In order to support the extraction effect of a beginning 33 of a web 26,the cutting blades 3 on the cutting blade cylinder 2 or the cuttingblade cylinder 116, shown in FIG. 8, can be retracted inside thecircumference 148 of the cutting blade cylinder 116, at least in thevicinity of the nip 136. In the depiction of FIG. 8, both the pointneedles 10 of the cylinder 117 and the cutting blades 3 of the cuttingblade cylinder 116 are retracted in the vicinity of the nip 136.

The beginning 33 of the web 26 and thereafter, consequently, the entireweb 26 can be supplied to the ribbon or signature-grasping andtransporting apparatus 36 and to the disposal apparatus 28.

A control body 147, which is connected to the side frame 21 or 22, whichis, for example, oval in cross section, and which can rotate on theshaft of the cutting blade cylinder 116, is provided in order to retractthe cutting blades 3 in the vicinity of the nip 136. This control body147 is seen in FIG. 8 and can be rotated by mechanisms that are notshown, for example by working cylinders, through an angle β of 90°, inrelation to the outer cutting blade cylinder 116 so that the verticalaxis 150 of the cross-sectionally oval control body 147 no longer pointsin the direction of the cam rollers 152 as shown in FIG. 8, but pointsin the direction of the cutting blades 3. Depending on the position ofthe control body 147, the cutting blades 3 are either inside thecircumference 148 of the cutting blade cylinder 116, as shown in FIG. 8or are positioned in the normal, operational position that is not shown,i.e. outside the circumference 148, when they are in the vicinity of thenip 136.

The cutting blades 3 of cutting blade cylinder are each supported atboth ends by two-armed elbow levers 149 that are supported in the endplates 151. There can be several elbow levers 149 for each cutting blade3.

A first end of the elbow lever 149 supports a cam roller 152 and asecond end of the elbow lever 149 supports the cutting blade 3 in acutting blade holder 153. The side of the cutting blade holder 153, thatis oriented away from the cutting edge of the cutting blade 3, has afriction reducing antifriction layer 154, with which the cutting blade153 is supported on the surface of the control body 137.

In a suitable manner, the cutting blade cylinder 116 has brushes 156 onits casing surface or circumference 148, which are used to press thepaper web ribbon 26 against the counter cutter strip and collectingcylinder 117.

While preferred embodiments of a device for the transverse cutting of atleast one web in a folding apparatus, in accordance with the presentinvention, have been set forth fully and completely hereinabove, it willbe apparent to one of skill in the art that various changes in, forexample, the type of printing press used to print the web, the overallsize of the press, and the like could be made without departing from thetrue spirit and scope of the present invention which is accordingly tobe limited only by the appended claims.

1. A device for the selective extraction of at least one web in a folding apparatus comprising: a cutting blade cylinder; a collecting cylinder opposite to said cutting blade cylinder and cooperating with said cutting blade cylinder at a point of cylinder cooperation to define a cylinder nip at said point of cylinder cooperation; at least one cutting blade carried by said cutting blade cylinder and being useable with said collecting cylinder to transversely cut the web into signatures at said cylinder nip; an exit nip for said collecting cylinder, said exit nip being located after, in a direction of rotation of said collecting cylinder, said cylinder nip and before a transfer point for signatures cut from the web by said at least one cutting blade cylinder and said collecting cylinder; means selectively retracting said at least one cutting blade inside a circumferential surface of said cutting blade cylinder at said cylinder nip during cessation of cutting of the web into signatures; point needles on said collecting cylinder, said point needles being selectively engageable with a leading end of the web at said cylinder nip; and a point needle control system for selectively retracting said point needles out of engagement with the leading end of the web and inside a circumferential surface of said collecting cylinder before said cylinder nip, and for retaining said point needles retracted inside said collecting cylinder at said collecting cylinder nip and at said cylinder exit nip, to release a leading end of at least one web from said collecting cylinder at said cylinder exit nip after said cylinder nip defined by said cutting blade cylinder and said collecting cylinder and before said transfer point, said point needles retraction at said cylinder nip occurring at the same time as the retraction of the at least one blade such that lengths of web are extracted from the folding apparatus prior to being folded.
 2. The device of claim 1 including a cutting blade holder, said at least one cutting blade being disposed in said cutting blade holder and wherein said cutting blade cylinder includes a shaft and further including a cam supported on said shaft and extending coaxial with said shaft, said cam being rotatable on said shaft and being said means to selectively retract said at least one cutting blade inside of said circumferential surface of said cutting blade cylinder at said cylinder nip.
 3. The device of claim 2 further including side frames of the folding apparatus and an adjustable control body secured to said side frames, said cutting blade holder being in frictional contact with said adjustable control body.
 4. The device of claim 1 further including brushes on said circumferential surface of said cutting blade cylinder. 